Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
  • D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
  • D06P3/02—Material containing basic nitrogen
  • D06P3/04—Material containing basic nitrogen containing amide groups
  • D06P3/14—Wool
  • D06P3/20—Wool using mordant dyes using metallisable dyes
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
  • D06B17/00—Storing of textile materials in association with the treatment of the materials by liquids, gases or vapours
  • D06B17/04—Storing of textile materials in association with the treatment of the materials by liquids, gases or vapours in wound form

Definitions

• the technical information paper D 1293 published by ICI discloses a process for the dyeing of wool by a pad-cold-dwell method using reactive dyestuffs, according to the recommendations of the IWS (International Wool Secretariat). Furthermore, metal complex dyestuffs are also used in the pad-cold-dwell process for dyeing wool, according to P.D. Report No. 136, entitled "Further Development of the Pad-Batch-Process" which has been published in April 1971 by this Secretariat.
• This kind of dyeing wool is generally considered to be a novel, semi-continuous and fiber-protecting method. Hitherto, however, this process has not been used in practice on a large scale. The main reason therefore certainly resides in the fact that the exploitation of the dyes and correspondingly the color yield of the dyeings is not satisfactory. Moreover a tendering of the woollen material, inspite of the cold-dwelling procedure, cannot be excluded since extremely high amounts of urea must be used.
• the pH of the padding liquor is adjusted to a value ranging from 5 to 6.5 by the addition of acetic acid and the liquor is then employed for padding.
• the padding liquor may further contain auxiliaries, which assist a uniform wetting of the textile material made of wool or prevent the so-called frosting effect on the woollen fibers. These auxiliaries, however, do not exert any influence on the dyestuff fixation. Said fixation is rendered possible only be the addition of urea and by adequate temperature or dwelling conditions.
• the dyestuffs are fixed neither by steaming them or with the supply of another heat energy, but simply by allowing them to dwell at a temperature of from 75° to 85° C.
• the batched-up goods are advantageously slowly rotated during the dwelling process.
• the color intensity to be attained on woollen material in the process of the invention is very high and nearly reaches that obtained by the exhaustion process. It must be taken into consideration that metal complex or reactive dyestuffs are nearly completely exhausted in the exhaustion process.
• the dyestuff yield obtained amounts to about 80% of that obtained in the exhaustion process.
• the dyestuff yields obtained hitherto in pad-dwell processes range between about 10 and 20% of the complete yield; consequently, processes of this type according to the state of the art yielded only light to medium shades.
• extremely deep shades having good fastness properties can be obtained with a normal dyestuff feed, and moreover the dyeing technique is very easy technically and requires no considerable expenditure on apparatus.
• Dyeings of such deep color intensity are obtained without using any of the conventional textile auxiliaries or additives, which are, for example, used in the process according to Belgian Pat. No. 607,179.
• the color intensity obtained is extremely surprising and was not to be expected at all by one skilled in the art.
• the easy and economic dyeing method is remarkable.
• no levelling agents there are used no levelling agents.
• woollen material or textile material containing wool in whatever state of processing, can be dyed very fast and deep shades, especially without any tendering of the fiber.
• urea For the feed rates of urea from 80 to 120 g/l a damaging of the fiber by urea cannot take place.
• the complicated chemism involving a partial transformation of urea into isocyanate must be taken into consideration, as it has likewise a detrimental effect on the woollen fibers.
• Suitable dyestuffs for the process of the invention are the relatively difficultly soluble 1:2 metal complex dyestuffs and 1:1 metal complex dyestuffs.
• These dyestuffs include 1:2 chromium or cobalt complex compounds of azo dyes, especially monoazo dyes, i.e. complex compounds in which 2 molecules of an identical azo dyestuff or each time 1 molecule of two azo dyestuffs which are different from one another are linked in complex manner to one chromium or cobalt atom.
• the complex compound may contain, for example, a disazo dyestuff and a monoazo dyestuff or preferably two identical or different monoazo dyestuffs molecules.
• Further suitable metal complex dyestuffs are metallized azo dyestuffs which contain per molecule of dyestuff only one metal atom linked in complex manner (1:1 metal complex compounds), especially copper, chromium or cobalt.
• These azo dyes contain as metal complex forming groupings preferably o,o'-dihydroxyazo groupings.
• the dyestuff exploitation in the process of the invention is optimal.
• the color intensity is no more improved by doubling or tripling the quantity of urea.
• a feed rate of urea of 300 g/l to the padding liquor yields the same color intensity as a feed rate of urea of 100 g/l, provided that the novel dyeing method hereinbefore described is employed.
• the use of the lower quantity of urea has the advantage that the wool is not tendered while the color intensity remains the same.
• the process of the invention is suitably carried out with batching-up times of different length to assure an operation as economic as possible, i.e. a rapid operation.
• Light shades require a period of from 4 to 6 hours, medium shades of from 6 to 8 hours and deep shades a period of from 8 to 14 hours.
• Navy blue shades require relatively long batching-up times. Principally batching-up times which surpass the above limits have no detrimental effect.
• a woollen fabric is padded with the liquor prepared, which has a temperature of about 65° C., with a liquor pick-up of 100% (calculated on the weight of the goods).
• the treated goods are thereafter batched-up on a roller.
• This batching-up process is carried out with the supply of heat to make the temperature of the batching-up roller increase to about 80° C.
• After a dwell time of 5 hours at this temperature the textile material is rinsed in conventional manner and washed out. There is obtained a deep yellow-orange dyeing.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Materials Engineering (AREA)
• Coloring (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=5985153

Family Applications (1)

Country Status (7)

Families Citing this family (1)

Citations (2)

Family Cites Families (3)

• 1976
  • 1976-08-11 DE DE2635990A patent/DE2635990C2/de not_active Expired
• 1977
  • 1977-08-09 US US05/823,156 patent/US4141683A/en not_active Expired - Lifetime
  • 1977-08-09 IT IT26613/77A patent/IT1086306B/it active
  • 1977-08-10 JP JP9520577A patent/JPS5324485A/ja active Pending
  • 1977-08-11 GB GB33729/77A patent/GB1575227A/en not_active Expired
  • 1977-08-11 BE BE180095A patent/BE857703A/fr unknown
  • 1977-08-11 FR FR7724698A patent/FR2361499A1/fr active Granted

Patent Citations (2)

Non-Patent Citations (1)

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